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Directly Down & Up Wind Faster than the Wind

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Uploaded on Aug 15, 2010

http://en.wikipedia.org/wiki/Sailing_...

This animation shows how windpowered rotor vechicles can go directly downwind or directly upwind, faster than the true wind. To simplfy matters the air mass is reduced to a thin column of air, that moves relative to the ground, and colides with the rotating blade of the rotor.

The only difference between the downwind and the upwind case is the pitch of the blade. In the downwnd case the rotor works as a propeller, turned by the wheels. In the upwind case it works as a turbine, that turns the wheels.

For analysis see this paper:
http://www.ewec2009proceedings.info/a...

Directly downwind faster than the wind :
http://www.fasterthanthewind.org
http://www.youtube.com/watch?v=5Ccgmp...

Directly upwind faster than the wind :
https://fasterthanthewind.wordpress.com
http://www.youtube.com/watch?v=F7PNSy...

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